Watchtower itself works great, it doesn’t need a GUI for what it does.

But updating containers in general, either manually or automatically, always carries a risk of something breaking due to the new update.

One thing you can do is make sure you’re not using :latest tags in your compose files, and instead pin major versions like postgres:13

And of course make sure you have backups going back multiple points in time in case something does break, and test those backups!

Backblaze B2 with Cloudflare? Designed for CDN use, and is $6/TB with free data transfer between B2 and CF.